ADU · Delaware County
Can you build an ADU in Sidney, NY?
Town of Sidney has 6 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the Sidney code indicates by district
The table below shows how each district treats ADUs, alongside the lot and setback standards that govern a second unit. District boundaries and conditions vary, so treat this as a starting point and confirm the district that applies to your parcel.
| District | Min lot | Setbacks F / S / R | Max height | ADU |
|---|---|---|---|---|
| Sidney Center Hamlet — the hamlet district and the town’s smallest minimum lot. SERVICE-TIER LOT SIZE, THE FIFTH DELAWARE JURISDICTION WITH ONE: 7,200 sq ft where the lot IS served by sewers but not less than 3,500 sq ft PER DWELLING UNIT, against 20,000 sq ft where it is NOT, and not less than 10,000 sq ft per dwelling unit. The sewered figure (0.1653 acres) is recorded as the base per the county convention, so ESTABLISH THE SERVICE TIER BEFORE USING minLotSize — an unsewered lot needs 2.8x the land. Note the per-dwelling-unit figures are the binding constraint on anything above one unit: a two-family dwelling needs 7,200 sq ft sewered (2 x 3,500 fits inside it) but 20,000 sq ft unsewered. Lot width at building line 75 ft; front yard 25 ft; maximum height two and one-half storeys not to exceed 36 ft. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. NO LOT COVERAGE LIMIT is stated for this or any other base district — the only coverage figure in the entire law is the CPD overlay’s 30%, so the null here is correct and must not be filled in from the overlay. Unlike the R and MD districts this one states NO minimum road frontage, so lot width at the building line is the only width constraint. Permitted principal uses are a single-family dwelling, a two-family dwelling, churches and parish houses, public parks and playgrounds not operated for gain, public and accredited non-profit private schools, public libraries, and land or buildings used by the Town or by Delaware County for administration, water supply, sewerage, fire or police. § 603 adds a special-permit route for a small assembly, business or mercantile space with an occupant load of at most 25 people, capped at 500 sq ft with a single room dimension of no more than 30 ft, off-street parking set back 10 ft from property lines and 4 ft from any road right-of-way, no parking on the public shoulder or right-of-way, no offensive odour, noise, smoke, dust, heat, electrical interference or glare detectable beyond the lot lines, and hours no earlier than 7:00 AM or later than 9:00 PM. | 0.1653 ac | 25 / 25 / 25 ft | 36 ft | No |
| Residential District — Article VI-C. Its use list opens by incorporating the SC-R district wholesale (“any use permitted and as regulated in the SC-R District”) and then repeats that list, so the two districts permit the same things and differ only in their dimensions. SERVICE-TIER LOT SIZE, THE FIFTH DELAWARE JURISDICTION WITH ONE: 7,200 sq ft where the lot IS served by sewers but not less than 3,500 sq ft PER DWELLING UNIT, against 20,000 sq ft where it is NOT, and not less than 10,000 sq ft per dwelling unit. The sewered figure (0.1653 acres) is recorded as the base per the county convention, so ESTABLISH THE SERVICE TIER BEFORE USING minLotSize — an unsewered lot needs 2.8x the land. Note the per-dwelling-unit figures are the binding constraint on anything above one unit: a two-family dwelling needs 7,200 sq ft sewered (2 x 3,500 fits inside it) but 20,000 sq ft unsewered. Lot width at building line 100 ft; front yard 40 ft, which is 15 ft deeper than SC-R’s; maximum height two and one-half storeys not to exceed 36 ft. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. § 605-C ADDS A SEPARATE MINIMUM ROAD FRONTAGE OF 100 FT (amended 2023-01-13), which here happens to equal the lot width at the building line — do not assume that holds elsewhere in this town, because in RA the two figures differ by 150 ft. No lot coverage limit is stated; the null is correct. Note the two ways this district is easy to confuse: it is not the SC-R hamlet district despite sharing a use list, and it is not the VILLAGE of Sidney, which is a separate jurisdiction with its own eCode360 Chapter 215 and eight districts of its own. | 0.1653 ac | 40 / 25 / 25 ft | 36 ft | No |
| Residential-Agricultural District — Article VII, and the district most Sidney land outside the hamlets falls in. MINIMUM LOT AREA 5 ACRES, amended 2023-01-13; lot width at building line 100 ft; front yard 40 ft; maximum height 36 ft for residential buildings, with FARM STRUCTURES EXPRESSLY EXEMPT FROM ANY HEIGHT LIMIT. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. This district states TWO different width figures and they diverge by 150 ft: lot width at the building line is 100 ft, but § 702(6) separately requires a MINIMUM ROAD FRONTAGE OF 250 FT (amended 2023-01-13). minLotWidthFt records the 100 ft lot width because that is the field’s basis and the code’s own term, but on any new lot the 250 ft road-frontage requirement is what actually governs how many lots a road-fronting parcel can yield, and it is 2.5x the recorded figure. On a long thin parcel that requirement, not the 5-acre minimum, is what caps the lot count. USES ARE THE MOST PERMISSIVE IN THE TOWN: § 700 incorporates everything permitted in the R and MD districts and adds agricultural, floricultural and horticultural pursuits including general farms, greenhouses, nurseries, truck gardens, dairies and the raising of bees, poultry and livestock with all customary buildings; forest management; seasonal dwellings; animal hospitals, riding stables, kennels and furbearing animal farms provided pens and runways sit at least 100 ft from any adjoining property line (pasture and exercise tracks excepted); and MULTI-FAMILY DWELLINGS AS A PERMITTED PRINCIPAL USE, which is unusual for a 5-acre rural district and the most permissive residential provision found in this county so far. Private garages may hold up to four commercial vehicles registered to the owner, and such a garage may not exceed 75% of the overall lot width in depth. | 5 ac | 40 / 25 / 25 ft | 36 ft | No |
| Maywood District — Article VI-B, and a genuinely unusual district: § 600-B states that ALL PERMITTED USES WITHIN THE MAYWOOD DISTRICT WILL REQUIRE A SPECIAL USE PERMIT, so nothing here is as-of-right even though the section is headed “Permitted Principal Uses”. MINIMUM LOT SIZE IS NOT A NUMBER: § 601-B(4) sets it as “required to accommodate the proposed property use as determined by the Planning Board during Site Plan Review”, so minLotSize is null by design and no lot width or road frontage is stated either — those nulls are the code’s position, not unread fields. What IS fixed: front yard 25 ft, side and rear 25 ft for primary structures and 10 ft for accessory structures, and a maximum height of 36 ft measured FROM THE LOWEST GROUND ELEVATION, which is a stricter basis than the two-and-a-half-storey formulation used in the residential districts and matters on a sloping site. The district is a small mixed-use node: it incorporates the SC-R use list, then adds by special permit retail business (small), personal service shops, galleries, artist and music studios, cafés, business or professional offices, custom-work shops for trades such as woodworking, plumbing and electrical using only light machines and hand tools, building and farm supply with incidental millwork, feed and solid fuel storage, farm implement sales, service, rental and auctions, utility service buildings and storage yards when fenced, residential or solar installations specific to the business, assisted living facilities, group homes, senior housing and housing for the disabled under NYS Department of Health codes, major home occupations, large wind projects, commercial solar arrays and farms, and commercial recreation establishments. | — | 25 / 25 / 25 ft | 36 ft | No |
| Commercial District — Article VIII. Like the Maywood District it sets NO numeric minimum lot size: § 801(8) makes lot area “minimum lot size as required to accommodate the proposed property use as determined by the Planning Board during Site Plan Review”, so minLotSize, minLotWidthFt and maxLotCoverage are all null by design rather than unread. Front yard 25 ft; side and rear 25 ft for primary structures and 10 ft for accessory structures; maximum height 36 ft measured FROM THE LOWEST GROUND ELEVATION. The practical consequence is that every commercial project in Sidney is a Planning Board site plan review in which the dimensional envelope is set case by case, so there is no schedule to underwrite against and an early conversation with the Board is the only way to size a scheme. Signs in this district confine all advertising to the premises of the business advertised, cap a wall identification sign at two square feet per horizontal foot of the wall it sits on and at 75% of that wall’s width (90% where the wall is 20 ft or less), and allow a maximum 12-inch projection with no part extending above or beyond the wall. | — | 25 / 25 / 25 ft | 36 ft | No |
| Common Plan of Development Overlay — Article V-B, ADDED 2023-12-14 and the newest zoning instrument found in Delaware County. AN OVERLAY, NOT A STANDALONE DISTRICT: height, front setback, and side and rear setbacks are all expressly “same as the underlying district”, which is why those fields are null here. Three things change, and they are strict. MINIMUM LOT SIZE 10 ACRES and MINIMUM FRONTAGE 250 FT — the largest minimum lot in the town by a factor of two against RA’s five acres. MAXIMUM LOT COVERAGE 30%, WHICH IS THE ONLY LOT-COVERAGE FIGURE ANYWHERE IN THE TOWN OF SIDNEY ZONING LAWS; every base district states none. AND READ THE TOWN’S OWN COVERAGE DEFINITION BEFORE APPLYING IT: § 300 defines lot coverage as the portion of the lot covered by the horizontal cross section of all principal AND accessory buildings, PAVED PARKING LOTS, AND OTHER IMPERVIOUS SURFACES — so this 30% is an impervious-surface cap, not a building-footprint cap, exactly as in the Town of Delhi, and on a 10-acre commercial or solar site the parking and access drives consume it fast. Maximum lot depth-to-width ratio 4:1. The front setback carries an additional contextual rule: same as the underlying district, OR, where adjacent lots are developed, no new building line may cross the front plane of the closest buildings on adjacent lots. PROCEDURE IS THE OTHER TEETH: § 506-B requires any application for subdivision, site plan approval or a special use permit within the CPD to notify IN WRITING BY CERTIFIED MAIL every property within 1,000 FEET of the outside border of the parcel, with proof of mailing at time of application — an unusually wide notice radius that adds real time and cost to a schedule. | 10 ac | — | — | No |
ADUs vs. short-term rentals in Sidney
Short-term rentals restricted for Town of Sidney. Short-term rentals have no as-of-right path in the Town of Sidney, and the reason is structural rather than an express ban — read this before assuming either permission or prohibition. THE TOWN PLAINLY THOUGHT ABOUT IT: Article III defines "AIR BNB" in terms, as "an online marketplace which lets people rent out their properties or spare rooms to guests", and separately defines BED-AND-BREAKFAST as a private residence with at least two and not more than five guest rooms rented to transient guests with food service in the morning only, which must be the operator’s prime residence and may employ no more than two people outside the family. THEN NEITHER TERM APPEARS ANYWHERE ELSE IN THE 116-PAGE LAW. Both are defined and then never used: neither is a permitted principal use, a permitted accessory use, or a special permit use in ANY of the five base districts. THAT SILENCE IS NOT NEUTRAL HERE, BECAUSE THIS CODE IS EXPLICITLY CLOSED-LIST AND UNUSUALLY STRICT ABOUT IT. § 503 Equivalent Uses says that where a use is not listed as permitted in any district, the Code Enforcement Officer refers it to the Planning Board for an interpretation, which may recommend to the Town Board that the Local Law be AMENDED — and then states that "in no case shall a building permit be issued for an equivalent use until the Local Law has been amended to permit such equivalent use in the appropriate zoning district." Most codes let a zoning board interpret an unlisted use onto an existing category; Sidney requires an act of the Town Board. So the lawful route to an STR here is a text amendment, not a permit — which is why this is recorded restricted rather than permitted or prohibited. RECORDED AS AN INFERENCE FROM THE CLOSED-LIST CLAUSE, NOT AS A QUOTED RULE. There is no sentence anywhere saying short-term rentals are forbidden, and in a rural town of this size the Code Enforcement Officer’s practice may be considerably more permissive than § 503 reads. WORTH RAISING WITH THE TOWN AS A DRAFTING DEFECT: defining two transient-lodging terms in a law adopted 2021 and amended twice in 2023, and then listing neither as a use in any district, looks like an omission rather than a decision — particularly for the bed-and-breakfast, whose definition is detailed enough (guest-room count, owner-occupancy, employee cap) to have been drafted for a district it never reached. These are separate questions from whether you can build an ADU — a unit you're allowed to add isn't automatically one you're allowed to rent nightly, so check both.
Good to know
- Residential lot minimum0.1653 ac — an ADU still has to fit the district's lot and setback envelope.
- Last reviewed2026-08-24
ADU FAQ — Sidney, NY
Are ADUs allowed in Sidney, NY?
Town of Sidney has 6 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department.
Do I need a special permit for an ADU in Sidney?
No. No district in Town of Sidney permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department before ruling it out.
Can I use an ADU as a short-term rental in Sidney?
Short-term rentals restricted for Town of Sidney. ADU occupancy and short-term-rental rules are separate: an ADU you can build isn't automatically one you can rent nightly. Confirm both before you count on STR income.
What an ADU costs to build in Sidney
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $185k–245k at a standard finish, and the per-square-foot rate comes in above a full house because the kitchen, bath, panel and heating plant cost the same either way. See the full cost to build an ADU in Sidney, priced by size.
More on Sidney: Full zoning for new construction · ADU build cost · House build cost · All Delaware County towns
ADU information for Town of Sidney is compiled from the municipal code (last reviewed 2026-08-24) and provided for decision-support only — not legal or architectural advice. ADU eligibility, size, owner-occupancy and permit conditions vary by district and often carry exceptions; verify with the municipality before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.